[8.15] [Synthetics] waterfall chart - handle cached resources (#193089) #193376
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## Summary Resolves elastic#184794 Ensures that the cached resources display accurate timing information on the waterfall chart tooltips. The information displayed should match the information displayed in the flyout when the request url is clicked. Tooltip <img width="555" alt="Screenshot 2024-09-16 at 8 49 55 PM" src="https://github.com/user-attachments/assets/516653bc-dcec-4681-965b-08711417ab67"> Flyout <img width="424" alt="Screenshot 2024-09-16 at 2 07 56 PM" src="https://github.com/user-attachments/assets/5fb0bf1c-c65d-4ce3-8a6a-5e95700209dd"> ### Release note Synthetics - resolves an issue for multi step browser journeys where timings for cached resources within the same step were inaccurate within the waterfall chart. ### Testing 1. Create a browser monitor with duplicate requests. For example: ``` step("multi resource step", async () => { await page.goto('https://github.com'); await page.goto('https://github.com'); await page.goto('https://github.com'); }) ``` 2. Navigate to the monitor details page 3. Find the last test run panel, click the view test details button, then click the view performance breakdown button   4. Scroll down to the waterfall chart. If you use github, requests after about 115 should be cached. Note: some request may have been aborted and their waterfall tooltip won't show. Find a request that was not aborted, hover to see the tooltip, then click the request to view the flyout and confirm the information. (cherry picked from commit 6f4be61)
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